干旱区生态环境知识资源中心(Arid): Oxidant system and ABA drive germination in seeds of palm species with differences in desiccation tolerance

Arid

DOI	10.1017/S0960258522000095
	Oxidant system and ABA drive germination in seeds of palm species with differences in desiccation tolerance
	Santos, Talita Raissa Silva; Bicalho, Elisa Monteze; Garcia, Queila Souza
通讯作者	Garcia, QS
来源期刊	SEED SCIENCE RESEARCH
ISSN	0960-2585
EISSN	1475-2735
出版年	2022
卷号	32 期号:3 页码:157-165
英文摘要	We investigated the thermal thresholds to seed germination and the variations in abscisic acid (ABA) levels and oxidative metabolism during seed dormancy-breaking and germination in two palm species with differences in desiccation tolerance. We used Mauritia flexuosa (buriti palm, desiccation-sensitive seeds) from swampy habitats (Veredas) and Attalea speciosa (babassu, desiccation-tolerant seeds) from the transition zone between the forest and semi-arid region (drained soils). Germination was evaluated at 15-40 degrees C after dormancy-breaking (operculum removal). At optimal temperature for both species (30 degrees C), embryos were sampled in distinct germination phases - dry, imbibed, after operculum removal and at early germination - and used for quantifying ABA and hydrogen peroxide (H2O2) content, antioxidant enzyme activities and for histolocalization of superoxide anion (O-2(-)). Seeds of M. flexuosa germinated only in a narrow temperature range (25-35 degrees C), while A. speciosa seeds germinated between 15 and 40 degrees C. After operculum removal, reduced ABA levels in embryos of M. flexuosa were accompanied by constant H2O2 levels, while in A. speciosa, similar levels of ABA and H2O2 were maintained throughout all germination phases. The presence of O-2(-) was restricted to the haustorium, and an increase in O-2(-) accumulation was observed in both species after operculum removal. Similarities were noted between both species regarding enzyme activities; however, the activities were higher in embryos from M. flexuosa. The presence of O-2(-) only in the haustorium indicates that this region of the embryo is an active structure following imbibition and is involved in germination itself, not just functioning in reserve mobilization.
英文关键词	Arecaceae desiccation tolerance orthodox seed oxidative signalling recalcitrant seed Veredas
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000803780000001
WOS关键词	GLUTATHIONE-REDUCTASE ; SUPEROXIDE-PRODUCTION ; DORMANCY ; STORAGE ; ACID ; RECALCITRANT ; EMBRYO ; HISTOCHEMISTRY ; MANAGEMENT ; VIABILITY
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/394475
推荐引用方式 GB/T 7714	Santos, Talita Raissa Silva,Bicalho, Elisa Monteze,Garcia, Queila Souza. Oxidant system and ABA drive germination in seeds of palm species with differences in desiccation tolerance[J],2022,32(3):157-165.
APA	Santos, Talita Raissa Silva,Bicalho, Elisa Monteze,&Garcia, Queila Souza.(2022).Oxidant system and ABA drive germination in seeds of palm species with differences in desiccation tolerance.SEED SCIENCE RESEARCH,32(3),157-165.
MLA	Santos, Talita Raissa Silva,et al."Oxidant system and ABA drive germination in seeds of palm species with differences in desiccation tolerance".SEED SCIENCE RESEARCH 32.3(2022):157-165.